From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6016836606E; Fri, 10 Jul 2026 13:38:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783690720; cv=none; b=MXaY8D1k1ne9PQePV8wy6XMZOZpo1v9qGvSMAIz5Jl9N+lpflKxMLxuBpc8yL4z41v5J1glJHGJLvDQ1jIeC1bRgXzZPAhIoxafNOJ3iwfxMGfwIodS+XTmVY2iR2Am1EheYUIwMQXj7gxaDCvJKWrQc20e7vHaqrRB+hHs5utA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783690720; c=relaxed/simple; bh=AbUym04ZrcbLlU7wzT/cD6xheByZo+M5g5/EvhrXTcE=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=d8X/wH8Cjz5Xrd+z+Z9ejt2wLCP6HFAmAlsdSYuOPqY5sci2ojjFn7ghryD8dDnbV1Dihg9c2175697fvp1se/Ot8tdPKGh5y/+F9Zc7QyufyZ0C6n0jihRWLZz64O9DL6ZqcwQuSHqeg7PSIgJwu7eLKRf10lswP12BEEqYnFo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CC5oHrcH; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="CC5oHrcH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 82C4B1F000E9; Fri, 10 Jul 2026 13:38:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783690719; bh=Dr75iurr/Aftukj1yhP8xmnQ2vbnHM+g3MxyUwf8X34=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=CC5oHrcHJq2mM01v1ybM+f6avUfIezNN8yNjNiG+c1JLFRduDXy5tT7tiJ4OlInpv dkKn2NXuSVdyReYE5tn1Omb/6ETh8h8MfiVGBZ+Ey635EdVhaqyH10XNQzILRNO2EL iojnAZ1S31gQPrMjCVXzdZl0bIzM+iIz+YVmER4YCGMzPB/yX3PzoCU8FnoAecKON3 0x6VtbuPGh5OOLKUsTx4uDyuTLnaI+kEar8ntPv3qa632a1RVO39+nPpS/6b8qtFXA 3M5/1gR++4zqtFZx+s3+C27nDkff8mQ1XhN7uudV+Lz8F0Aye+UcH539SseQEdSBmn RmPek87lyENHw== Message-ID: <1c652464-32b7-4411-8ed2-2885234513cc@kernel.org> Date: Fri, 10 Jul 2026 14:38:33 +0100 Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 00/11] : media: iris: Migrate iommus to iris sub nodes To: Vikash Garodia , Dikshita Agarwal , Abhinav Kumar , Mauro Carvalho Chehab , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Konrad Dybcio Cc: linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Vishnu Reddy References: <7GAZnP6jPoRrcDnaVzeaB98cONLhtvbiEXV1yD5MJJrA9pCnC9lmlSiCGA8vlDezSXADjmFiqo3ZdClO5SxCFA==@protonmail.internalid> <20260709-vpu_iommu_iova_handling-v1-0-72bb62cb2dfd@oss.qualcomm.com> From: Bryan O'Donoghue Content-Language: en-US Autocrypt: addr=bod@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10/07/2026 14:36, Vikash Garodia wrote: >> What's the addressable range with sub-nodes ? >> >> The original problem you were trying to solve was the total addressable >> size - this other problem here segmenting the linear allocation space is >> adjacent but not the same thing. >> >> Without digging through all of the patches here - my question is does >> the original sub-node addressable space problem get resolved in your >> proposal here ? > The proposal solves both the problem we have so far - total addressable > size as well as which segment (or range) in that is_not_ addressable. So if I can distill this. You're proposing two objects in the DT one for each relevant IOMMU SID and then the driver will register two different devices to get the full range addresses ? --- bod